ni·tro·bac·te·ri·um (n  tr -b k-tîr  - m)n. pl. ni·tro·bac·te·ri·a (-tîr -) Any of various soil bacteria that take part in the nitrogen cycle, oxidizing ammonium compounds into nitrites or nitrites into nitrates. |
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| Noun | 1. | nitrobacterium - any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates bacteria, bacterium - (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants nitrate bacterium, nitric bacterium - any of the nitrobacteria that oxidize nitrites into nitrates nitrite bacterium, nitrous bacterium - any of the nitrobacteria that oxidize ammonia into nitrites |
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